Nice talk, a good explanation of what PHP is doing behind the scenes and how opcache can speed it up.

I have a question that i've thought of since the talk - what happens if you install opcache on a server than is running multiple websites? Is there a shared cache that will quickly get overwhelmed or will php cache each site individually?

In short - is this only for use on sites that run on their own servers? If anyone knows I would be interested to hear, thanks.

Very interesting and despite the fairly heavy subject matter, everything was explained clearly and well enough that I could follow despite not having much experience with OPCache or the underbelly of PHP. I think fewer examples of opcode optimisations and a bit more time on where/how to use OPCache might've been more beneficial to me, but that would probably be better to cover in another talk.

As James Shaw highlighted, a bit more time on where/how to use OPcache might have been more beneficial?

We already use OPCache with PHP 5.5 so I was hoping to see some configuration options or maybe some optimisation tips. What the talk covered was instead, a rather interesting and detailed explanation about how it all works, rather than any configuration/optimisation.

Not sure what I can take away from this talk.

Great speaker, and very detailed explanation of how it all works with great accompanying slides.